Ok so I have those 2 secondary air injection codes (P0491 & P0492)…I’ve been battling this problem for a year now. And the code still won’t go away! I’ve replaced everything down the line that involves it! But now I’m second guessing the two hose Inlets at the side of intake manifold. And would like an opinion first because I’ve taken apart that damn thing 8 dozen times and I’m getting really sick of it. Now the oem diagram shows the hose with non return goes on top and then the hose to the reservoir on the bottom, then I’ve seen a diagram on here that shows the reverse and I went the route of the reverse way? Also does that solenoid thing it connects to have a fuse? Maybe the fuse blew for that. I’m so frustrated.